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river landscape, physical processes - Coggle Diagram
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physical processes
transport and deposition
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saltation
smaller pebbles bounced along river bed, picked up then dropped as river flow changes
suspension
finer sand and silt particles carried along in flow, giving river brown apperance
solution
some minerals (e.g. chalk) dissolved in water and carried along in flow, they can't be seen
weathering processes
mechanical
- water fills a crack in the rock
- water freezes and crack is widened
- repeated freeze-thaw action increases size of crack until block of rock breaks off
- looses blocks of rock are called scree
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mass movement
sliding
tock, weathered or eroded material or earth moves down a slope. gravity pulls weakened material quickly downwards
slumping
where river erodes bottom of valley slope, making it stepper. material above slides downwards, particularly if it's saturated with rainwater
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